JIS Sup9, 5155, 55cr3 Spring Steel Round Bar

• Type: Special Steel Bar
• Standard: AISI, ASTM, JIS, GB
• Composition: Alloy
• Technique: Hot Rolled
• Shape: Bar
• Surface Treatment: Coated
• Model NO.: KM-26
• Special Use: Free Cutting Steel
• Application: Tool Steel Bar
• Size: 5X5 mm - 60X60 mm
• Length: 1m - 6m ,or as Request.
• Quality Certificate: ISO, SGS, BV
• Inspection: The Third Party or Welcome Your Visiting to Inspec
• MOQ: 500 Kgs
• Delivery Time: 20-25 Days for 20′′ Gp
• Loading Port: Chinese Main Port
• Payment Term: T/T L/C
• Transport Package: Standard Sea-Worthy Package
• Specification: 5x5 mm - 60x60 mm
• Trademark: Kingmetal
• Origin: China
• Production Capacity: 2000 Ton/Tons / Month

Product Description

SUP9 Spring Steel | 55CrMnA | 55Cr3 | 1.7176 | 527A60 | 55C3 | ASTM 5155

JIS SUP9 Steel Rod is a high quality Cold work Spring Steel, It belong to the high quality high carbon alloy Spring Steel. Oil Quenched & Tempered Hardness is 28-34 HRc. SUP9 steel Annealing delivery hardenss less than 250HB.

 

Chemical Composition of SUP9 

C(%)	0.52-0.60	Si(%)	0.15-0.35	Mn(%)	0.65-0.95	P(%)	≤0.030
S(%)	≤0.035	Cr(%)	0.65-0.95

 

SUP9 Alloy Spring Steel Equivalent to 

USA	Germany	China	Japan	France	England	Italy	Poland	ISO	Austria	Sweden	Spain
-	DIN,WNr	GB	JIS	AFNOR	BS	UNI	PN	ISO	ONORM	SS	UNE
5155 / G51550	55Cr3 / 1.7176	55CrMnA	SUP9	55C3	≈527A60			55Cr3

Heat treatment Related for 1.7176 Spring Steel 

• Annealing of SUP9 Spring Steel
  Slowly heated to 740-770 ºC and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The SUP9 tool  steel will get MAX 250 HB (Brinell hardness).
   
• Hardening of SUP9 Spring Steel
  SUP9 steels should be heated uniformly to 830-860°C (1526-1580°F) until completely heated through. About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil.
   
• Tempering of SUP9 Spring Steel
  Tempering of SUP9 steels is performed at 460-510°C, Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness.

 

Mechanical Properties of SUP9 Spring Steel 

The mechanical properties of SUP9 Spring Steels are outlined in the following table.

Tensile strength	Conditions to yield strength	Elongation	Reduction of area	Hardness (Hot Rolled)	Hardness (Cold Drawn)
σb (MPa):≥1225(125)	σ0.2 (MPa):≥1080(110)	δ5 (%):≥9	ψ (%):≥20	≤321HB;

Applications of SUP9 

SUP9 steels, Highlight the advantage is good hardenability, another hot working performance, comprehensive mechanical properties, Decarburization resistance is also good big cross section of various important spring, such as automobile, locomotive, large plate spring, spring, etc. SUP9 Spring main used for heavy vehicles, tractors, industrial production load, stress and the diameter of the larger plate spring and helical spring